Preparation process for waterborne polyurethane emulsion

A technology for water-based polyurethane and preparation process, which is applied in the field of organic polymer materials and can solve the problems of easy water absorption, low water resistance of water-based polyurethane emulsions, and inability to water soaking.

Active Publication Date: 2017-09-05
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the water-based polyurethane emulsion products synthesized by the internal emulsification method are easy to absorb water, which leads to poor wet adhesion of the product, is not resistant to water immersion, and is also prone to yellowing, resulting in great limitations in its practical application.
For example, the patent publication number CN104293159A discloses a synthesis process of water-based polyurethane coatings, which reacts polyether polyols and aromatic isocyanates and uses glucose as a cross-linking agent to synthesize water-based polyurethane emulsions, and then adds aminosil

Method used

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preparation example Construction

[0022] The invention provides a kind of preparation technology of aqueous polyurethane emulsion, comprises the following steps:

[0023] a) reacting carbon dioxide copolymer polyol, aliphatic diisocyanate and hydrophilic chain extender under the action of a catalyst to obtain a reactant;

[0024] b) reacting the reactant with an epoxy silane coupling agent and a salt-forming agent to obtain a prepolymer;

[0025] c) adding water to the prepolymer to emulsify it, and reacting it with an amine chain extender to obtain an aqueous polyurethane emulsion.

[0026] The present invention first uses carbon dioxide copolymer polyol, aliphatic diisocyanate and hydrophilic chain extender to carry out catalytic reaction, then introduces epoxy silane coupling agent and salt-forming agent for neutralization reaction, and finally adds water to emulsify and mix with amines The chain extender reacts to prepare water-based polyurethane emulsion. According to the preparation process of the pres...

Embodiment 1

[0045] After dehydrating 60 parts by weight of carbon dioxide copolymer polyol (the number average molecular weight is 3000, and the hydroxyl functionality is 2), add 4.4 parts by weight of dimethylol propionic acid hydrophilic chain extender, 26 parts by weight of isophorone Diisocyanate, 0.12 parts by weight of stannous octoate catalyst, reacted at 80 ° C for 4 hours; after the reaction, the temperature was lowered to 30 ° C, and 1.8 parts by weight of KH-560 silane coupling agent and 3.3 parts by weight of triethylamine were added to react for 0.5 hours , then add 20 parts by weight of acetone to reduce viscosity, then add 185 parts by weight of deionized water to emulsify at a high speed of 3000r / min for 10 minutes, then add ethylenediamine of 0.96 parts by weight to continue the reaction for 0.5 hours; after the reaction is completed, the temperature is raised to 40°C, reduce the pressure to -0.9MPa to remove acetone, and obtain a water-based polyurethane emulsion.

Embodiment 2

[0047] After dehydrating 60 parts by weight of carbon dioxide copolymer polyol (the number average molecular weight is 3000, and the hydroxyl functionality is 2), add 4 parts by weight of dimethylol butyric acid hydrophilic chain extender, 17.8 parts by weight of isophorone Diisocyanate, 0.12 parts by weight of stannous octoate catalyst, react at 80°C for 4 hours; after the reaction, cool down to 30°C, add 1.6 parts by weight of KH-560 silane coupling agent and 2.4 parts by weight of triethylamine to react for 0.5 hours , then add 20 parts by weight of acetone to reduce viscosity, then add 168 parts by weight of deionized water to emulsify at a high speed of 3000r / min for 10 minutes, then add ethylenediamine of 0.4 parts by weight to continue the reaction for 0.5 hours; after the reaction is completed, the temperature is raised to 40°C, reduce the pressure to -0.9MPa to remove acetone, and obtain a water-based polyurethane emulsion.

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PUM

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Abstract

The invention provides a preparation process for a waterborne polyurethane emulsion. The preparation process comprises the following steps: a) subjecting carbon dioxide copolymer polyol, aliphatic diisocyanate and a hydrophilic chain extender to a reaction under the action of a catalyst so as to obtain a reaction product; b) reacting the reaction product obtained in the step a) with an epoxy silane coupling agent and a salt forming agent so as to obtain a performed polymer; and c) adding water into the performed polymer, carrying out emulsification and then reacting the emulsified performed polymer with an amine chain extender so as to obtain the waterborne polyurethane emulsion. The waterborne polyurethane emulsion prepared by using the preparation process has good resistance to water soaking and yellowing.

Description

technical field [0001] The invention belongs to the technical field of organic polymer materials, in particular to a preparation process of water-based polyurethane emulsion. Background technique [0002] Polyurethane is a common polymer material, which refers to a general term for a class of polymers containing urethane bonds (-NHCOO-) in the main chain of the molecule, and can be widely used in coatings, adhesives, leather finishing agents, Paints, ink adhesives, paper sizing, packaging films, waterproof textiles and many other fields. Water-based polyurethane in polyurethane overcomes the shortcomings of solvent-based polyurethane due to the use of water instead of organic solvents as the dispersion medium. Due to its non-toxic, energy-saving, high-strength, safe and reliable characteristics, water-based polyurethane is gradually replacing traditional solvent-based polyurethane emulsions Material. [0003] At present, the synthesis method of water-based polyurethane emu...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/44C08G18/34C08G18/12C08G18/08C08G18/00
CPCC08G18/003C08G18/0823C08G18/12C08G18/348C08G18/44C08G18/6659C08G18/3228
Inventor 麻乐李慧兰谢芸刘保华宋丽娜
Owner GUANGDONG UNIV OF TECH
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